JUSTIN Timberlake partied so hard at his bash Friday night at Avalon, he couldn’t make it to perform at Clive Davis’ annual pre-Grammy bash at the Beverly Hills Hilton Saturday night. “Justin is sick,” Davis told the crowd. “He is home with a 103-degree temperature.” One spy in the crowd snickered, “He didn’t look so sick to me when he was out partying at five this morning.” Smokey Robinson filled in for the chart topper by crooning “My Girl.” Dancing in the crowd was Nick Lachey – who spent the night trying to avoid his ex-father-in-law, Joe Simpson, who was there escorting his surgically enhanced youngest daughter, Ashlee Simpson. “Ashlee was flirting with J.C. Chasez,” said one spy, “but it’s creepy how the dad is always around.” Jessica Simpson was not there, despite an appearance by her rumored boyfriend, John Mayer. “She didn’t want to run into Nick,” another spy said, “it would be too awkward.” Also enjoying performances by Pink, Akon, Christina Aguilera and Jennifer Hudson were Meg Ryan, Terrence Howard, a sober Whitney Houston, Naomi Campbell and her date Quincy Jones and Ellen DeGeneres and Portia De Rossi.